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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Astroteilchenphysik

HK 7.2: Talk

Monday, March 4, 2013, 11:30–11:45, HSZ-401

Active volume studies with depleted and enriched BEGe detectors — •Katharina von Sturm — Eberhard Karls Universität Tübingen, Germany — Universitá degli Studi di Padova, Italy

The Gerda experiment is currently taking data for the search of the 0νββ decay in ⁷⁶Ge. In 2013, 30 newly manufactured Broad Energy Germanium (BEGe) diodes will be deployed which will double the active mass within Gerda. These detectors were fabricated from high-purity germanium enriched in ⁷⁶Ge and tested in the HADES underground laboratory, owned by SCK·CEN, in Mol, Belgium.

As the BEGes are source and detector at the same time, one crucial parameter is their active volume which directly enters into the evaluation of the half-life. This talk will illustrate the dead layer and active volume determination of prototype detectors from depleted germanium as well as the newly produced detectors from enriched material, using gamma spectroscopy methods and comparing experimental results to Monte-Carlo simulations. Recent measurements and their results will be presented and systematic effects will be discussed.

This work was partly supported by the German BMBF.